Multi-cavity synchronous cooling high-precision medical injection mold and molding process

Abstract

The application discloses a kind of multi-cavity synchronous cooling high-precision medical injection mold and forming process, it is related to injection mold technical field, including bottom plate, the top of the bottom plate is provided with forming mechanism, for injection cooling forming, the forming mechanism includes: limiting component, set in the top of bottom plate, for limiting plastic part shape;Cooling assembly, including fixed in the both sides of limiting component heat pipe, the outside of the heat pipe is provided with limiting plate, the side of the limiting plate is inserted and installed, plastic part heat is quickly transferred to heat pipe by punch, die, then by heat pipe evenly introduced into the cooling water in flow guide pipe, heat conduction sheet and exhaust fan cooperate to carry out secondary cooling to cooling water in pipeline, the heat conduction fin in water tank is continuously reduced circulating water basic temperature under the action of cooling fan airflow, water pump drives cooling water to circulate stably, so that cooling water temperature keeps consistent in whole waterway, effectively eliminate temperature gradient along the way, realize multi-cavity synchronous uniform cooling.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, specifically to a high-precision medical injection mold with multi-cavity synchronous cooling and its molding process. Background Technology

[0002] Injection molds are the core tooling for molding medical plastic products. They are mainly used to shape molten medical plastics, forming a regular molding cavity through mold closing and locking, and using a cooling system to quickly solidify the melt. An ejector mechanism then allows for smooth demolding of the finished product. They can stably control the shape, dimensions, and structure of the plastic parts, ensuring consistency in appearance and structure across batches. When combined with appropriate molding processes, they can efficiently complete the mass production of various precision medical plastic parts. They are an indispensable key piece of equipment for achieving standardized, large-scale mass production of medical injection molded parts and ensuring the basic molding quality of the products.

[0003] The existing invention patent with publication number CN115384014B discloses a multi-cavity rapid prototyping injection mold with high cooling efficiency, belonging to the field of injection mold technology. A multi-cavity rapid prototyping injection mold with high cooling efficiency includes a base, a lower mold base fixedly connected to the base, a support frame on the base, a hydraulic rod on the support frame, and an upper mold base at the end of the hydraulic rod away from the support frame. Both the lower and upper mold bases have cavities, which cooperate to form an injection mold cavity. A water tank is provided on the base, and a water pump is installed in the water tank. An inlet pipe and an outlet pipe are connected to the water tank. The lower mold base has an outlet pipe and an inlet pipe that cooperate with the inlet and outlet pipes. A filter screen for filtering impurities is installed on the inlet pipe. This invention facilitates the effective removal of residual moisture in the cooling channels of the mold, preventing condensate from corroding the mold, increasing the service life of the injection mold, and reducing maintenance costs.

[0004] Based on the aforementioned existing technologies, conventional through-type water channel layout structures are mostly adopted. As the cooling water flows through the pipes, it continuously absorbs heat from the mold, and the water gradually heats up along the transport path, resulting in a significant temperature gradient along the cooling pipes and significant differences in heat exchange efficiency in different areas of the mold. At the same time, traditional cooling structures cannot perform precise temperature control based on the actual wall thickness differences of the plastic parts. The thick-walled heat storage area and the thin-walled rapid heat dissipation area cannot achieve differentiated temperature control, ultimately resulting in extremely uneven heat distribution inside the cavity and large temperature differences between areas. This easily leads to inconsistent solidification and shrinkage rates in different parts of the plastic part during injection molding, generating large residual internal stresses, which in turn cause deformation defects such as product warping, bending, and dimensional deviations, making it difficult to meet the requirements of high-precision medical plastic parts molding accuracy and mass production stability. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-precision medical injection mold with multi-cavity synchronous cooling and a molding process. It solves the problems of continuous heat absorption and temperature rise during the flow of cooling water, resulting in significant temperature differences along the water path; inability to adjust the water temperature in different zones based on the differences in the wall thickness of the plastic part, resulting in poor temperature control flexibility; uneven distribution of heat and cold inside the cavity and excessive regional temperature differences, which can easily cause uneven shrinkage and deformation of the plastic part, making it difficult to guarantee molding accuracy.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-cavity synchronous cooling high-precision medical injection mold, comprising a base plate, wherein a molding mechanism is disposed above the base plate for injection cooling molding, the molding mechanism comprising: A limiting component, located above the base plate, is used to limit the shape of the plastic part; A cooling assembly includes heat spreaders fixed to both sides of a limiting assembly. A limiting plate is provided on the outer side of the heat spreader. A heat pipe is inserted and installed on one side of the limiting plate. An air guide pipe is fixedly installed on one side of the limiting plate. An exhaust fan is fixedly installed at the end of the air guide pipe. A flow guide pipe is fixedly installed inside the air guide pipe. A split pipe is connected to the top of the flow guide pipe. A connecting pipe is fixedly installed at one end of the split pipe. A heat-conducting plate is fixedly installed on the outer side of the flow guide pipe. The circulation component, located at the bottom of the limit component, is used to initially reduce the temperature of the circulating water.

[0007] Preferably, the limiting component includes a guide shaft fixedly installed above the base plate, a punch and a die being inserted through the center of the guide shaft, a slide rail being fixedly installed above the base plate, and a slider pair being fitted above the slide rail.

[0008] Preferably, the guide shaft is fixedly installed at both ends of the base plate and the two ends of the vertical rods on the left and right sides. The four corners of the punch and die are slidably connected to the corresponding guide shafts. The bottom of the punch and die is provided with a horizontal rectangular protrusion. The slider pair is fixedly installed at the four corners of the bottom surface of the punch and die.

[0009] Preferably, limit push rods are fixedly installed on both sides of the punch and die, and a rectangular recessed structure is provided on the back of the punch and die for installing a heat spreader plate. The bottom surface of the back of the punch and die is consistent with the shape of the cavity.

[0010] Preferably, the heat spreader is fixedly installed inside the recessed structure on the back of the punch and die, the heat pipes are arranged in an array on one side of the heat spreader, one end of the heat pipe passes through the limiting plate and is located inside the guide pipe, the front end of the air guide pipe is inverted "T" shape and the rear end is "L" shape, and the rear end of the air guide pipe is fixedly connected to the guide pipe, the guide pipe is "U" shaped, and the two ends of the guide pipe are respectively connected to the bottom branches of the corresponding branch pipes.

[0011] Preferably, the diverter is mirror-symmetrically installed on both sides of the guide tube, and the heat-conducting plate is annularly installed at the front section of the guide tube, with half of the heat-conducting plate penetrating the guide tube and the other half located between the outer side of the guide tube and the inner wall of the air guide tube.

[0012] Preferably, the circulation assembly includes a water tank fixedly installed above the horizontal protrusion at the bottom of the punch and die, a flow guide shroud fixedly installed on one side of the water tank, cooling fans fixedly installed at both ends of the flow guide shroud, a water pump provided on one side of the water tank, a drain pipe connected to the drain outlet of the water pump, and heat-conducting fins horizontally installed inside the water tank.

[0013] Preferably, one side of the water tank is connected to the bottom end of the connecting pipe on the same side, the cooling fans on both sides of the guide shroud have the same exhaust direction, the water pump is connected to the water tank through the drain pipe, and the drain outlet of the water pump is connected to the bottom end of the connecting pipe on the same side.

[0014] Preferably, the heat-conducting fins are horizontally and vertically equidistantly installed inside the water tank, and the two sides of the heat-conducting fins do not contact the inner wall of the water tank. One end of the heat-conducting fin penetrates through the vertical wall of the water tank, and the end is located inside the flow guide shroud. This invention also discloses a high-precision medical injection molding process with multi-cavity synchronous cooling, comprising the following steps: S1. After the mold is closed by the limiting component, the shape of the mold cavity is restricted, and injection molding is performed; S2. After injection molding is completed, the heat of the plastic part will be conducted to the cooling component, and cooling water will be circulated in the cooling component through the circulation component to reduce the temperature of the cooling component. S3. Fine-tune the cooling rate of each area of ​​the plastic part by controlling the speed of the exhaust fan in the cooling assembly.

[0015] Beneficial effects This invention provides a high-precision medical injection mold with multi-cavity synchronous cooling and a molding process. Compared with the prior art, it has the following advantages: 1. This multi-cavity synchronous cooling high-precision medical injection mold and molding process features recessed structures on the back of the punch and die that conform to the shape of the cavities. A heat spreader plate for cooling components is fitted into these recesses. Heat pipes are arrayed on one side of the heat spreader plate and extend into the guide tube. Heat-conducting fins, air ducts, and exhaust fans are located on the outside of the guide tube. Heat-conducting fins are installed inside the water tank of the circulation component, and a guide shroud and cooling fan are fitted to the outside of the water tank. A water pump provides power for the cooling water circulation. During operation, the heat from the plastic part is rapidly transferred to the heat spreader plate via the punch and die, and then evenly introduced into the cooling water within the guide tube by the heat pipes. The heat-conducting fins and exhaust fan work together to further cool the cooling water in the pipes. The heat-conducting fins in the water tank continuously reduce the base temperature of the circulating water under the airflow of the cooling fan. The water pump drives the cooling water to circulate stably, ensuring a consistent temperature throughout the entire water circuit, effectively eliminating temperature gradients along the process, and achieving synchronous and uniform cooling of multiple cavities. 2. This multi-cavity synchronous cooling high-precision medical injection mold and molding process features punches and dies corresponding to different wall thickness areas of the plastic part. The heat pipes of the cooling component are arranged in an array according to wall thickness, and the guide pipes are segmented to correspond to each cavity area. The heat-conducting plates, air guide pipes, and exhaust fans are set independently in each zone, allowing for individual speed and temperature control. The water pump, distribution pipes, and connecting pipes of the circulation component work together to evenly distribute cooling water to each section of the guide pipes. During operation, the punches and dies transfer heat differentially between thick-walled and thin-walled areas. The heat conduction of the heat pipes in corresponding areas is different. By adjusting the speed of the exhaust fans at the corresponding positions, the cooling intensity of each area can be flexibly changed. The thick-walled heat storage area is cooled more intensely, while the thin-walled heat dissipation area is cooled less intensely, achieving precise temperature control according to the wall thickness of the plastic part and greatly improving the flexibility of temperature control. 3. This multi-cavity synchronous cooling high-precision medical injection mold and molding process utilizes a high-precision cavity formed by the closing of the punch and die. Heat is evenly conducted through the mold, and the heat spreader of the cooling component fits against the heat distribution surface of the cavity. Heat pipes comprehensively cover all areas of the cavity for heat extraction, while guide pipes, heat-conducting fins, air ducts, and exhaust fans work together for efficient heat dissipation. The water tank, heat-conducting fins, and cooling fan of the circulation component continuously provide low-temperature cooling water, while the water pump, connecting pipes, and distribution pipes ensure stable circulation of the cooling water. During operation, the punch and die ensure accurate cavity dimensions and even heat conduction. The heat spreader quickly smooths out temperature differences on the cavity surface, heat pipes evenly dissipate heat from all areas, and cooling water in the guide pipes continuously exchanges heat. The circulation component maintains the low-temperature stability of the cooling system, ensuring consistent temperature across all areas of the cavity. This synchronizes the solidification and shrinkage rates of all parts of the plastic part, reduces residual internal stress, and avoids defects such as warping and dimensional deviations, ensuring the molding accuracy of high-precision medical plastic parts. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the punch and the die of the present invention.

[0017] Figure 3This is a schematic diagram of the slider pair mounting structure of the present invention.

[0018] Figure 4 This is a schematic diagram of the installation structure of the limiting push rod of the present invention.

[0019] Figure 5 This is a schematic diagram of the air duct installation structure of the present invention.

[0020] Figure 6 This is a schematic diagram of the heat-conducting sheet installation structure of the present invention.

[0021] Figure 7 This is a schematic diagram of the connection structure between the heat pipe and the limiting plate of the present invention.

[0022] Figure 8 This is a schematic diagram of the water tank installation structure of the present invention.

[0023] Figure 9 This is a schematic diagram of the connection structure between the water pump and the connecting pipe of the present invention.

[0024] Figure 10 This is a schematic diagram of the heat-conducting fin installation structure of the present invention.

[0025] In the diagram: 1. Base plate; 2. Forming mechanism; 21. Limiting component; 211. Guide shaft; 212. Punch; 213. Die; 214. Slide rail; 215. Slider pair; 216. Limiting push rod; 22. Cooling component; 221. Heat spreader; 222. Limiting plate; 223. Heat pipe; 224. Air duct; 225. Exhaust fan; 226. Flow guide pipe; 227. Diverter pipe; 228. Connecting pipe; 229. Heat-conducting plate; 23. Circulation component; 231. Water tank; 232. Flow guide shroud; 233. Cooling fan; 234. Water pump; 235. Drain pipe; 236. Heat-conducting fins. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1 - Figure 10 The present invention provides a technical solution: A high-precision medical injection mold with multi-cavity synchronous cooling and molding process includes a base plate 1, and a molding mechanism 2 is arranged above the base plate 1 for injection cooling molding. The molding mechanism 2 includes: A limiting component 21, disposed above the base plate 1, is used to limit the shape of the plastic part. The limiting component 21 includes a guide shaft 211 fixedly installed above the base plate 1. A punch 212 and a die 213 are inserted through the center of the guide shaft 211. A slide rail 214 is fixedly installed above the base plate 1. A slider pair 215 is fitted above the slide rail 214. The guide shaft 211 is fixedly installed at both ends of the front and rear ends of the base plate 1 and at both ends of the vertical rods on the left and right sides. The punch 212 and the die 213 are also fixedly installed at these ends. The four corners of the punch 212 and the corresponding guide shaft 211 form a sliding connection. The bottom of the punch 212 and the die 213 is provided with a horizontal rectangular protrusion. The slider pair 215 is fixedly installed at the four corners of the bottom surface of the punch 212 and the die 213. Limiting push rods 216 are fixedly installed on both sides of the punch 212 and the die 213. The back of the punch 212 and the die 213 is provided with a rectangular recessed structure for installing the heat spreader 221. The bottom surface of the back of the punch 212 and the die 213 is consistent with the shape of the cavity.

[0028] Specifically, the punch 212 and the die 213 are slidably connected to the guide shaft 211 via a linear bearing, and are slidably connected to the slide rail 214 via a slider pair 215 at the bottom, thereby restricting the movement direction of the punch 212 and the die 213. The distance between the punch 212 and the die 213 is adjusted by the limiting push rods 216 on both sides of the punch 212 and the die 213 to perform mold closing and mold opening operations. One side of the punch 212 and the die 213 is provided with an injection port that communicates with the mold cavity. The bottom surface of the recessed structure on the back of the punch 212 and the die 213 is consistent with the shape of the cavity, so that after filling the recessed part of the back of the punch 212 and the die 213 with polyether-type polyurethane (PU) non-silicone thermally conductive gel, the mold wall thickness between the thermally conductive gel and the plastic part remains consistent.

[0029] The cooling assembly 22 includes a heat spreader 221 fixed to both sides of the limiting assembly 21. A limiting plate 222 is provided on the outer side of the heat spreader 221. A heat pipe 223 is inserted and installed on one side of the limiting plate 222. A vent pipe 224 is fixedly installed on one side of the limiting plate 222. An exhaust fan 225 is fixedly installed at the end of the vent pipe 224. A flow guide pipe 226 is fixedly installed inside the vent pipe 224. A branch pipe 227 is connected to the top of the flow guide pipe 226. A connecting pipe 228 is fixedly installed at one end of the branch pipe 227. A heat-conducting plate 229 is fixedly installed on the outer side of the flow guide pipe 226. The heat spreader 221 is fixedly installed inside the recessed structure on the back of the punch 212 and the die 213. The heat pipe 223 is... The array is installed on one side of the heat spreader 221. One end of the heat pipe 223 passes through the limiting plate 222 and is located inside the guide pipe 226. The front end of the air guide pipe 224 is inverted "T" shape and the rear end is "L" shape. The rear end of the air guide pipe 224 is fixedly connected to the guide pipe 226. The guide pipe 226 is "U" shaped. The two ends of the guide pipe 226 are respectively connected to the bottom branches of the corresponding branch pipe 227. The branch pipe 227 is installed symmetrically on both sides of the guide pipe 226. The heat conduction plate 229 is installed in a ring at the front section of the guide pipe 226. The heat conduction plate 229 passes through the guide pipe 226, with half of it located inside the guide pipe 226 and the other half located between the outer side of the guide pipe 226 and the inner wall of the air guide pipe 224.

[0030] Specifically, thermally conductive gel is filled between the heat spreader 221 and the conformal structure of the recessed bottom surface of the punch 212 and die 213. During the cooling and curing process, the heat of the plastic part is transferred to the heat spreader 221 through the thermally conductive gel, and then absorbed by the heat pipe 223. The cooling medium inside the heat pipe 223 absorbs heat and vaporizes, transferring the heat to the outer end of the heat pipe 223. The guide pipe 226 covering the outer side of the heat pipe 223 allows circulating water to flow through the outer end of the heat pipe 223. The heat pipe 223 is cooled down, causing the heat transfer medium inside the heat pipe 223 to release heat and liquefy, flowing back to the contact part between the heat pipe 223 and the heat spreader 221 through capillary effect, forming a cooling medium circulation. The air duct 224 covers the outside of the flow guide pipe 226. The exhaust fan 225 at the front end of the air duct 224, together with the heat-conducting plate 229 between the air duct 224 and the flow guide pipe 226, performs secondary cooling on the circulating water, adjusting the temperature of the cooling water flowing through the heat pipe 223 in different areas.

[0031] The circulation component 23, located at the bottom of the limiting component 21, is used to initially reduce the temperature of the circulating water. The circulation component 23 includes a water tank 231 fixedly installed above the horizontal protrusion at the bottom of the punch 212 and die 213. A flow guide shroud 232 is fixedly installed on one side of the water tank 231, and cooling fans 233 are fixedly installed at both ends of the flow guide shroud 232. A water pump 234 is located on one side of the water tank 231, and a drain pipe 235 is connected to the drain outlet of the water pump 234. Heat-conducting fins 236 are horizontally installed inside the water tank 231. One side of the water tank 231 is connected to the bottom of the connecting pipe 228 on the same side. The cooling fans 233 on both sides of the flow guide 232 have the same exhaust direction. The water pump 234 is connected to the water tank 231 through the drain pipe 235. The drain port of the water pump 234 is connected to the bottom of the connecting pipe 228 on the same side. The heat-conducting fins 236 are installed horizontally and vertically at equal intervals inside the water tank 231. The two sides of the heat-conducting fins 236 do not contact the inner wall of the water tank 231. One end of the heat-conducting fins 236 penetrates the vertical wall of the water tank 231 and the end is located inside the flow guide 232.

[0032] Specifically, the water tank 231 can hold a certain amount of cooling water. The airflow position generated by the cooling fan 233 is restricted by the guide shroud 232 on the outside of the water tank 231, so that the airflow flows between the heat-conducting fins 236 to reduce the temperature of the circulating water in the water tank 231. The circulating water is transported by the water pump 234 and enters the front connecting pipe 228 from the water tank 231. It is then diverted by the diversion pipe 227 into the front end of the guide pipe 226, flows through the heat-conducting fins 229, enters the rear diversion pipe 227 from the rear end of the guide pipe 226, and finally enters the drain port of the water pump 234 from the rear connecting pipe 228 to form a cooling water circulation.

[0033] This invention also discloses a high-precision medical injection molding process with multi-cavity synchronous cooling, comprising the following steps: S1. After the mold is closed by the limiting component 21, the shape of the mold cavity is restricted, and injection molding is performed; S2. After injection molding is completed, the heat of the plastic part will be conducted to the cooling component 22, and cooling water will be circulated in the cooling component 22 through the circulation component 23, thereby reducing the temperature of the cooling component 22. S3. The cooling rate of each area of ​​the plastic part is finely adjusted by controlling the speed of the exhaust fan 225 in the cooling assembly 22.

[0034] Specifically, the limit push rod 216 is model E-PFH16-d16-L100, and the water pump 234 is model TOPSFLO TL-C01-12V. In addition, all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0035] During operation, the base plate 1 provides support for the entire device, and the molding mechanism 2 is installed above the base plate 1. The guide shaft 211 of the limiting component 21 is fixed at both ends of the base plate 1. The four corners of the punch 212 and the die 213 are slidably connected to the guide shaft 211. The slide rail 214 is fixed above the base plate 1. The slider pair 215 is installed at the four corners of the bottom surface of the punch 212 and the die 213 and fits into the slide rail 214. The limiting push rod 216 is fixed on both sides of the punch 212 and the die 213. The recessed bottom surface of the back of the punch 212 and the die 213 conforms to the shape of the cavity. The recessed interior and the space between it and the heat spreader 221 are filled with thermally conductive gel, making heat conduction more uniform and efficient. During operation, the limiting push rod 216 pushes the punch 212 and the die 213 to smoothly close the mold along the guide shaft 211 and the slide rail 214, forming a closed cavity for injection molding. After injection molding, the heat of the plastic part is transferred through the mold wall and efficiently conducted to the heat spreader 221 that is attached to the mold. The heat spreader 221 quickly absorbs and evenly distributes the heat. The heat pipes 223 are arranged in an array and pass through the limiting plate 222. One end contacts the heat spreader 221 and the other end extends into the guide pipe 226, continuously introducing the heat into the cooling water in the guide pipe 226. The water tank 231 of the circulation component 23 is installed above the horizontal protrusion at the bottom of the punch 212 and the die 213. It is equipped with heat-conducting fins 236 inside. The flow guide 232 is fixed on one side of the water tank 231. The cooling fan 233 is installed at both ends of the flow guide 232. The water pump 234 is connected to the water tank 231 through the drain pipe 235. The drain port of the water pump 234 is connected to the bottom end of the connecting pipe 228. The top end of the connecting pipe 228 is connected to the branch pipe 227. The branch pipe 227 is then connected to both ends of the flow guide 226. Driven by the water pump 234, the cooling water enters the flow guide 226 from the water tank 231 through the connecting pipe 228 and the branch pipe 227. After absorbing the heat from the heat pipe 223, it flows back to the water pump 234 and the water tank 231, completing the water cooling cycle. Meanwhile, the air duct 224 is fixed to one side of the limiting plate 222 and wraps around the guide tube 226. The exhaust fan 225 is installed at the end of the air duct 224. The heat-conducting plate 229 penetrates the wall of the guide tube 226, with half of it submerged in water and half inside the air duct 224. The exhaust fan 225 generates airflow, which cools the cooling water in the guide tube 226 through the heat-conducting plate 229. One end of the heat-conducting fins 236 in the water tank 231 extends into the guide shroud 232. The cooling fan 233 blows airflow through the heat-conducting fins 236, continuously reducing the base temperature of the circulating water in the water tank 231. By adjusting the speed of the exhaust fans 225 in different areas, the cooling intensity of each area of ​​the plastic part can be controlled accordingly, achieving strong cooling in thick-walled areas and weak cooling in thin-walled areas. After cooling is completed, the limiting push rod 216 drives the punch 212 and the die 213 to smoothly separate along the guide shaft 211 and the slide rail 214, completing the demolding of the plastic part.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-precision medical injection mold with multi-cavity synchronous cooling, characterized in that: Includes a base plate (1), and a molding mechanism (2) is provided above the base plate (1) for injection molding and cooling. The molding mechanism (2) includes: A limiting component (21) is disposed above the base plate (1) to limit the shape of the plastic part; The cooling assembly (22) includes a heat spreader (221) fixed to both sides of the limiting assembly (21). A limiting plate (222) is provided on the outer side of the heat spreader (221). A heat pipe (223) is inserted and installed on one side of the limiting plate (222). A duct pipe (224) is fixedly installed on one side of the limiting plate (222). An exhaust fan (225) is fixedly installed at the end of the duct pipe (224). A flow guide pipe (226) is fixedly installed inside the duct pipe (224). A split pipe (227) is connected to the top of the flow guide pipe (226). A connecting pipe (228) is fixedly installed at one end of the split pipe (227). A heat-conducting plate (229) is fixedly installed on the outer side of the flow guide pipe (226). The circulation component (23) is located at the bottom of the limiting component (21) and is used to initially reduce the temperature of the circulating water.

2. The high-precision medical injection mold with multi-cavity synchronous cooling according to claim 1, characterized in that: The limiting component (21) includes a guide shaft (211) fixedly installed above the base plate (1), a punch (212) and a die (213) are inserted through the center of the guide shaft (211), a slide rail (214) is fixedly installed above the base plate (1), and a slider pair (215) is fitted above the slide rail (214).

3. The high-precision medical injection mold with multi-cavity synchronous cooling according to claim 2, characterized in that: The guide shaft (211) is fixedly installed at the front and rear ends of the base plate (1) and at the ends of the vertical rods on the left and right sides. The four corners of the punch (212) and the die (213) are slidably connected to the corresponding guide shaft (211). The bottom of the punch (212) and the die (213) is provided with a horizontal rectangular protrusion. The slider pair (215) is fixedly installed at the four corners of the bottom surface of the punch (212) and the die (213).

4. The high-precision medical injection mold with multi-cavity synchronous cooling according to claim 2, characterized in that: Limiting push rods (216) are fixedly installed on both sides of the punch (212) and the die (213). A rectangular recessed structure is provided on the back of the punch (212) and the die (213) for installing a heat spreader (221). The bottom surface of the recessed structure on the back of the punch (212) and the die (213) is consistent with the shape of the cavity.

5. A high-precision medical injection mold with multi-cavity synchronous cooling according to claim 2, characterized in that: The heat spreader (221) is fixedly installed inside the recessed structure on the back of the punch (212) and the die (213). The heat pipes (223) are arranged in an array on one side of the heat spreader (221). One end of the heat pipe (223) passes through the limiting plate (222) and is located inside the guide pipe (226). The front end of the air guide pipe (224) is inverted "T" shape and the rear end is "L" shape. The rear end of the air guide pipe (224) is fixedly connected to the guide pipe (226). The guide pipe (226) is "U" shaped. The two ends of the guide pipe (226) are respectively connected to the bottom branches of the corresponding branch pipe (227).

6. The high-precision medical injection mold with multi-cavity synchronous cooling according to claim 1, characterized in that: The diverter (227) is mirror-symmetrically installed on both sides of the guide tube (226). The heat-conducting plate (229) is installed in a ring at the front section of the guide tube (226), and the heat-conducting plate (229) penetrates the guide tube (226), with half located inside the guide tube (226) and the other half located between the outside of the guide tube (226) and the inner wall of the air guide tube (224).

7. A high-precision medical injection mold with multi-cavity synchronous cooling according to claim 1, characterized in that: The circulation assembly (23) includes a water tank (231) fixedly installed above the horizontal protrusion at the bottom of the punch (212) and the die (213). A flow guide (232) is fixedly installed on one side of the water tank (231), and cooling fans (233) are fixedly installed at both ends of the flow guide (232). A water pump (234) is provided on one side of the water tank (231), and a drain pipe (235) is connected to the drain outlet of the water pump (234). Heat-conducting fins (236) are horizontally installed inside the water tank (231).

8. A high-precision medical injection mold with multi-cavity synchronous cooling according to claim 7, characterized in that: One side of the water tank (231) is connected to the bottom end of the connecting pipe (228) on the same side. The cooling fans (233) on both sides of the flow guide (232) have the same exhaust direction. The water pump (234) is connected to the water tank (231) through the drain pipe (235). The drain outlet of the water pump (234) is connected to the bottom end of the connecting pipe (228) on the same side.

9. A high-precision medical injection mold with multi-cavity synchronous cooling according to claim 7, characterized in that: The heat-conducting fins (236) are installed horizontally and vertically at equal intervals inside the water tank (231), and the two sides of the heat-conducting fins (236) do not contact the inner wall of the water tank (231). One end of the heat-conducting fins (236) penetrates the vertical wall of the water tank (231), and the end is located inside the flow guide (232).

10. For a high-precision medical injection molding process with multi-cavity synchronous cooling, a high-precision medical injection mold with multi-cavity synchronous cooling as described in claims 1-9 is characterized in that: Includes the following steps: S1. After the mold is closed by the limiting component (21), the shape of the mold cavity is limited and injection molding is performed; S2. After injection molding is completed, the heat of the plastic part will be conducted to the cooling component (22), and cooling water will be circulated in the cooling component (22) through the circulation component (23) to reduce the temperature of the cooling component (22); S3. The cooling rate of each area of ​​the plastic part is finely adjusted by controlling the speed of the exhaust fan (226) in the cooling assembly (22).

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